[PATCH] [Power] Use AtomicExpandPass for fence insertion, and use lwsync where appropriate

[Bill Schmidt]

Minor typo on line 6558

================
Comment at: lib/Target/PowerPC/PPCISelLowering.cpp:6558
@@ +6557,3 @@
+    return callIntrinsic(Builder, Intrinsic::ppc_lwsync);
+  // FIXME: this is too conservative, a dependant branch + isync is enough.
+  // See http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html and
----------------
dependant => dependent

http://reviews.llvm.org/D5180